I will stand by my first post on this thread. My Challenge doesn’t like JSB pellets. I tried H&N Barracuda FT, it loves them. Makes great groupings at 55 yards (50m). Yes they drop more than 8.44gr pellets. They will do, because they’re heavier. Is that a problem for ME, shooting FT? No. If I miss a target (or 10), it’s me, not the pellets or my rifle. Try them out Astra. If your gun likes them too, then happy days. If not, try some other brand/types.